Omfg..I adore this drawing. :D I love the shading alot, but I have no idea who this guy is, besides that he's very hot. XD Stupid Air Gear. XD Awesome Job Agent T.
Though I really think that you did a good job with the picture itself technically and artistically I also feel as though the face and hair don't really give the same kinda feel as the original character even though you've got the posture spot on.
You are correct. In the original picture Kazu looked depressing. So I wanted wanted to change that. But Thank you ! I'm glad to hear you liked it. :3